<template>
  <div>
    <table>
      <thead>
          <th>序号</th>
          <th>书籍名称</th>
          <th>出版日期</th>
          <th>价格</th>
          <th>购买数量</th>
          <th>操作</th>
        </thead>
        <tbody>
          <tr v-for="(book, index) in booksList">
            <td>{{index + 1}}</td>
            <td>{{book.name}}</td>
            <td>{{book.date}}</td>
            <td>{{formatPrice(book.price)}}</td>
            <td>
              <button :disabled="book.count <= 1" @click="decrement(index)">-</button>
              <span class="counter">{{book.count}}</span>
              <button @click="increment(index)">+</button>
            </td>
            <td>{{book.count}}</td>
            <td>
              <button @click="removeBook(index)">移除</button>
            </td>
          </tr>
        </tbody>
    </table>
    <h2>总价格: {{formatPrice(totalPrice)}}</h2>
  </div>
</template>

<script>

   export default {
      data() {
        return {
          booksList: [
            {
              id: 1,
              name: '《算法导论》',
              date: '2006-9',
              price: 85.00,
              count: 1
            },
            {
              id: 2,
              name: '《UNIX编程艺术》',
              date: '2006-2',
              price: 59.00,
              count: 1
            },
            {
              id: 3,
              name: '《编程珠玑》',
              date: '2008-10',
              price: 39.00,
              count: 1
            },
            {
              id: 4,
              name: '《代码大全》',
              date: '2006-3',
              price: 128.00,
              count: 1
            },
          ],
        }
      },
      name: "",
      mounted() {},
      computed: {
        totalPrice() {
          let totalBookPrice = 0
          for(let i = 0; i < this.booksList.length; i++) {
            totalBookPrice += this.booksList[i].price * this.booksList[i].count
          }
          return totalBookPrice
        }
      },
      created() {

      },
      methods: {
        formatPrice(price) {
          return "¥" + price;
        },
        increment(index) {
          this.booksList[index].count++
        },
        decrement(index) {
          this.booksList[index].count--
        },
        removeBook(index) {
          this.booksList.splice(index, 1);
        },
      }
}
</script>

<style scoped>
table {
  border: 1px solid #e9e9e9;
  border-collapse: collapse;
  border-spacing: 0;
}

th, td {
  padding: 8px 16px;
  border: 1px solid #e9e9e9;
  text-align: left;
}

th {
  background-color: #f7f7f7;
  color: #5c6b77;
  font-weight: 600;
}

.counter {
  margin: 0 5px;
}

</style>
